(1) In REXX, the parts of a parsing template that allow a string to be split by literal pattern or positional pattern. Parentheses may be supplied to create a variable pattern.
(2) A sequence of characters used either with regular expression notation or for path name expansion, as a means of selecting various characters strings or path names, respectively. The syntaxes of the two patterns are similar, but not identical.
(3) A reusable description of the design and architecture, which is used to satisfy defined criteria.